1 files changed, 135 insertions, 0 deletions
diff --git a/bundles/org.eclipse.equinox.p2.metadata/src/org/eclipse/equinox/internal/p2/metadata/expression/Binary.java b/bundles/org.eclipse.equinox.p2.metadata/src/org/eclipse/equinox/internal/p2/metadata/expression/Binary.java
new file mode 100644
index 000000000..f4f7da504
--- /dev/null
+++ b/bundles/org.eclipse.equinox.p2.metadata/src/org/eclipse/equinox/internal/p2/metadata/expression/Binary.java
@@ -0,0 +1,135 @@
+/*******************************************************************************
+ * Copyright (c) 2010 Cloudsmith Inc. and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Cloudsmith Inc. - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.equinox.internal.p2.metadata.expression;
+
+import org.eclipse.equinox.internal.p2.metadata.expression.Member.DynamicMember;
+import org.eclipse.equinox.p2.metadata.Version;
+import org.eclipse.equinox.p2.metadata.expression.IExpressionVisitor;
+
+/**
+ * The abstract base class for all binary operations
+ */
+public abstract class Binary extends Expression {
+	public final Expression lhs;
+
+	public final Expression rhs;
+
+	protected Binary(Expression lhs, Expression rhs) {
+		this.lhs = lhs;
+		this.rhs = rhs;
+	}
+
+	public boolean accept(IExpressionVisitor visitor) {
+		return super.accept(visitor) && lhs.accept(visitor) && rhs.accept(visitor);
+	}
+
+	public int compareTo(Expression e) {
+		int cmp = super.compareTo(e);
+		if (cmp == 0) {
+			Binary be = (Binary) e;
+			cmp = lhs.compareTo(be.lhs);
+			if (cmp == 0)
+				cmp = rhs.compareTo(be.rhs);
+		}
+		return cmp;
+	}
+
+	public boolean equals(Object o) {
+		if (super.equals(o)) {
+			Binary bo = (Binary) o;
+			return lhs.equals(bo.lhs) && rhs.equals(bo.rhs);
+		}
+		return false;
+	}
+
+	public int getPriority() {
+		return PRIORITY_BINARY; // Default priority
+	}
+
+	public int hashCode() {
+		int result = 31 + lhs.hashCode();
+		return 31 * result + rhs.hashCode();
+	}
+
+	public void toString(StringBuffer bld, Variable rootVariable) {
+		appendOperand(bld, rootVariable, lhs, getPriority());
+		bld.append(' ');
+		bld.append(getOperator());
+		bld.append(' ');
+		appendOperand(bld, rootVariable, rhs, getPriority());
+	}
+
+	/**
+	 * Appends the LDAP filter attribute name from the lhs expression if
+	 * possible. 
+	 * @throws UnsupportedOperationException when this expression does not conform to an
+	 * LDAP filter binary expression
+	 */
+	void appendLDAPAttribute(StringBuffer buf) {
+		if (lhs instanceof DynamicMember) {
+			DynamicMember attr = (DynamicMember) lhs;
+			if (attr.operand instanceof Variable) {
+				buf.append(attr.getName());
+				return;
+			}
+		}
+		throw new UnsupportedOperationException();
+	}
+
+	private static char hexChar(int value) {
+		return (char) (value < 10 ? ('0' + value) : ('a' + (value - 10)));
+	}
+
+	static void appendLDAPEscaped(StringBuffer bld, String str) {
+		appendLDAPEscaped(bld, str, true);
+	}
+
+	static void appendLDAPEscaped(StringBuffer bld, String str, boolean escapeWild) {
+		int top = str.length();
+		for (int idx = 0; idx < top; ++idx) {
+			char c = str.charAt(idx);
+			if (!escapeWild) {
+				if (c == '*') {
+					bld.append(c);
+					continue;
+				} else if (c == '\\' && idx + 1 < top && str.charAt(idx + 1) == '*') {
+					bld.append("\\2a"); //$NON-NLS-1$
+					++idx;
+					continue;
+				}
+			}
+			if (c == '(' || c == ')' || c == '*' || c == '\\' || c < ' ' || c > 127) {
+				short cs = (short) c;
+				bld.append('\\');
+				bld.append(hexChar((cs & 0x00f0) >> 4));
+				bld.append(hexChar(cs & 0x000f));
+			} else
+				bld.append(c);
+		}
+	}
+
+	/**
+	 * Appends the LDAP filter value from the rhs expression if
+	 * possible. 
+	 * @throws UnsupportedOperationException when this expression does not conform to an
+	 * LDAP filter binary expression
+	 */
+	void appendLDAPValue(StringBuffer buf) {
+		if (rhs instanceof Literal) {
+			Object value = rhs.evaluate(null);
+			if (value instanceof String || value instanceof Version) {
+				appendLDAPEscaped(buf, value.toString());
+				return;
+			}
+		}
+		throw new UnsupportedOperationException();
+	}
+}